* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', 'SimHei', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
}

header {
    background: rgba(255, 255, 255, 0.95);
    text-align: center;
    padding: 2rem 1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

header h1 {
    color: #2c3e50;
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

header p {
    color: #7f8c8d;
    font-size: 1.1rem;
}

nav {
    background: rgba(255, 255, 255, 0.9);
    padding: 1rem;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.nav-btn {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.3);
}

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(52, 152, 219, 0.4);
    background: linear-gradient(135deg, #2980b9, #1f5f8b);
}

.nav-btn.active {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

#chart-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
}

.chart-section {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.chart-section.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.chart-section h2 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    font-weight: 600;
    padding-bottom: 1rem;
    border-bottom: 3px solid #3498db;
}

.chart-wrapper {
    position: relative;
    height: 400px;
    margin-bottom: 2rem;
    background: white;
    border-radius: 15px;
    padding: 1rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.data-table {
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    overflow-x: auto;
}

.data-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

.data-table th,
.data-table td {
    padding: 0.8rem 1rem;
    text-align: left;
    border-bottom: 1px solid #ecf0f1;
}

.data-table th {
    background: linear-gradient(135deg, #3498db, #2980b9);
    color: white;
    font-weight: 600;
    font-size: 1rem;
}

.data-table tr:hover {
    background-color: #f8f9fa;
}

.data-table tr:last-child td {
    border-bottom: none;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    nav {
        padding: 0.8rem;
    }
    
    .nav-btn {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }
    
    .chart-wrapper {
        height: 300px;
    }
    
    #chart-container {
        padding: 1rem;
        margin: 1rem;
    }
    
    .data-table {
        padding: 1rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 0.5rem;
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .chart-wrapper {
        height: 250px;
    }
    
    .nav-btn {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }
}

.loading {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 200px;
    color: #7f8c8d;
    font-size: 1.1rem;
}

.loading::after {
    content: '';
    width: 20px;
    height: 20px;
    border: 2px solid #3498db;
    border-top: 2px solid transparent;
    border-radius: 50%;
    margin-left: 10px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}